Nostr & Bitcoin product engineering
Products for identity, signing, and publishing for a self sovereign open social web
Threenine builds Nostr-native products and privacy-focused tools for identity, signing, publishing, and user control, then supports aligned teams building serious software around open protocols.
Open protocols only matter if they can be used without ceding control.
The old internet model runs on platform lock-in, surveillance, and weak user ownership. Threenine is focused on products that make identity, signing, publishing, and interaction more usable without pushing people back into custodial systems.
Product priorities
- Identity that you control instead of being trapped inside a platform.
- Signing flows that make consent clear and keep private keys under your control.
- Publishing tools that reduce friction instead of dragging creators through platform-owned workflows.
- Privacy-sensitive software that respects open protocols without surveillance and censorship.
Diogel
Manage multiple Nostr identities without giving websites your keys.
Diogel is a free, open-source NIP-07 signer for Chrome and Firefox. It keeps keys encrypted locally, makes approval flows readable, and gives people a cleaner way to use Nostr across multiple identities.
Encrypted local vault
Keys stay inside an encrypted password-protected vault with auto-lock support.
Multiple identities
Keep personal, work, and anonymous Nostr accounts separate without juggling separate tools.
Granular approvals
Review each request and control permissions by site and request type instead of blindly signing.
Relay control
Configure the relays you want to use so your setup matches your actual workflow.
Diogel
Free, open-source NIP-07 signer browser extension
Practical, protocol-aware software with privacy and sovereignty at the core.
Diogel leads today, but the wider product direction includes signing, publishing, interaction, and protocol-aware components that make Nostr-native software more usable.
How to Choose Nostr Relays
Learn how to choose Nostr relays without guesswork. This guide covers privacy, reliability, search support, relay quality, and what to avoid.
Nostr Relays, Privacy, and Security
Understand the privacy and security trade-offs of Nostr relays, including what relay operators can observe, what they cannot do, and how to use relays more safely.
What is a Nostr Relay?
Learn what a Nostr relay is, how relays work, and why they matter for privacy, censorship resistance, availability, and everyday use on Nostr.
Why Nostr keys and identity are better for privacy
Nostr replaces account recovery, phone-number signups, and centrally managed identities with cryptographic keys. That changes privacy, but it also shifts responsibility onto the user.
Best Nostr Browser Extensions (2026): Complete Comparison
Compare the best Nostr browser extensions of 2026. We review Diogel, Alby, Nos2x, and Nsec.app to help you choose the right NIP-07 signer for secure key management.
Product design & development
Threenine provide end-to-end product design and development services for Nostr & Bitcoin protocol based products and privacy-sensitive software.
Nostr Product Engineering
Focused engineering support for teams building signers, browser extensions, publishing flows, and protocol-aware product experiences.
Bitcoin Product Engineering
Secure, scalable Bitcoin applications — from wallets and payment integrations to Lightning Network solutions.
Our Mission
We don't just write code. We engineer sovereignty. Our products and consultancy services specialise exclusively in building the foundational web and mobile applications for a new digital renaissance. We architect systems that are inherently censorship-resistant, user-owned, and built on a bedrock of digital & financially sound foundations.